Most weddings have four or five musical selections as part of the ceremony. Although not an all-inclusive list, here is a list of pieces that work beautifully for different parts of the ceremony.
The Honor Seating: The beginning of the ceremony when special guests (parents, grandparents, etc.) are seated.
You Raise Me Up
Over the Rainbow
What a Wonderful World
The Water is Wide - Traditional Celtic
The Processional: This is typically broken into two songs, one for the attendants and one for the bride.
Edelweiss - The Sound of Music
All of Me - John Legend
Be Thou My Vision
Part of Your World - Disney's Little Mermaid
O Mio Babbino Caro - Puccini
Beauty and the Beast
Jesu Joy of Man's Desiring
The Bridal March
Cannon in D - Pachelbel
A Thousand Years - Christina Perri
Ceremony Meditation: For the lighting of the unity candle, the sand ceremony, or any other time of reflection.
O'Carolan's Draught - Traditional Celtic
Love Me Tender
Can You Feel the Love Tonight
Can't Help Falling in Love
Recessional: The end of the ceremony, after the new couple is introduced.
Purcell's Trumpet Tune
Beethoven's Ode to Joy
From This Moment
Marry You - Bruno Mars
Kiss the Girl - Disney's Little Mermaid